A method implements data visualization collaboration. The method displays, for a second user, an interface with a comment pane that displays a first comment text and a first thumbnail image of a data visualization generated according to a first visual specification, from a first user. In response to detecting an input from the second user to select the first thumbnail image, the method generates and displays the data visualization. The method receives, from the second user, input modifying the data visualization, and input specifying a second comment that refers to the data visualization. In response, the method generates a second thumbnail image and a second visual specification corresponding to the modified data visualization, and transmits that information along with the second comment text to the first user.